题目：

Synergistic Active Heterostructure Design for Enhanced Two Electron Oxygen Reduction via Chemical and Electrochemical Reconstruction of Heterosulfides

作者：

Kai Yu^1#, Hongyuan Yang^3#, Jie Xu^1,4*, Weijie Yuan¹, Ruotao Yang¹, Meiling Hou⁵, Zhenhui Kang¹*, Yang Liu¹, Prashanth W. Menezes^2,3* and Ziliang Chen^1,2*

摘要：

Transition metal sulfides, particularly heterostructures, represent a promising class of electrocatalysts for two electron oxygen reduction (2e^- ORR), however, understanding the dynamic structural evolution of these catalysts during alkaline ORR remains relatively unexplored. Herein, NiS₂/In_2.77S₄ heterostructure was synthesized as a precatalyst and through a series of comprehensive ex situ and in situ characterizations, including X-ray absorption spectroscopy, Raman spectroscopy, transient photo-induced voltage measurements, electron energy loss spectroscopy, and spherical aberration-corrected electron microscopy, it was revealed that nickel/indium (oxy)hydroxides (NiOOH/In(OH)₃) could be evolved from the initial NiS₂/In_2.77S₄ via both electrochemical and chemical-driven methods. The electrochemicaldriven phase featured abundant bridging oxygen-deficient [NiO₆]-[InO₆] units at the interfaces of NiOOH/In(OH)₃, facilitating a synergistic effect between active Ni and In sites, thus enabling an enhanced alkaline 2e^- ORR capability than that of chemical-driven process. Remarkably, electrochemically induced NiOOH/In(OH)₃ exhibited exceptional performance, achieving H₂O₂ selectivity of >90% across the wide potential window (up to 0.4 V) with a peak selectivity of >99%. Notably, within the three-electrode flow cell, a current density of 200 mA cm^-2 was sustained over 20 h, together with an impressive Faradaic efficiency of ~90% during the whole cycle process.

影响因子：

16.1

分区情况：

一区